Wheel-brake.



O. AALBORG.

WHEEL BRAKE.

APPLICATION FILED 11.10, 1908.

Patented Aplf. 30,1912.

INVENTOR WITNESSES:

ATTORNEY UNITED STATES PATENT OFFICE.

)HRIS'IIA'N AALBORG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNDR, BY MESNEASSIGNMENTS, 1'0 WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, OF EASTPITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENIJSYLVANIA.

WHEEL-BRAK E.

Patented Apr. 30, 33312 Application filed April 10, mos. Scirial. M0.

Log 1 489 Specification of Letters Patent.

ntluptetl for use with. electric motors, its releasing nnignet may besupplied i it To all whom it may; concern:

Be it known that l, Cnnisiimx AALBORG, n.--citizen ol the lnited States,and a resi. dent of \Vilhinshumy in the county of Allegheny un l Stateof Pei'i'nsylvnnin, have in vented a. new and useful IIUPIOVGIDQHl; in\Ylieel-lli'nlws, of which the following is a specification.

My invention relates to electrically re leased .whcel brakes, and it hasfor its oh ject to providc n device of this chnrnctei" that shall heespecially simple and compact in construction and that shall QlllbOLly amanually (incl-sited attachment for temporarily effecting the resultsnormallysecured by the electi'n-i'esponsive means.

My improved braking device is specially s nee energy from eitheralternating. 01 tlii'ect current sources without injury, llJ'lCl byreason of the relatively small space which the assembled deviceoccupies.

Figure 1 of the accompanying drawings is an end elevation of a deviceconstructed in accordance with my invention, the rots table pulley withwhich it is associated ing shown in section to disclose the operatingparts of the brake. and Fig. 2 is a sectional View of the device shownin Fig. 1, a portion of l. shaft and axle bearing being shown for thepurpose of illustrating the 21ppll 5fil7l0ll of the brake to the usualform of mot i. .J"

Ret'ewiug to the drawings, the device eon'ipi'iscs an Enclosing casing 1for a, supporting frame for the its anci is provided with base pie 1il'iil 3 innlnng Contact slices 4- ectv llfl ring: (1, :1 release meg-g2 V .nia ly ope'zitetl releasing ale 4.- nncl 5 pro vided with es nntlere pin sl'mil ts 9 we 16 which are n anal nnjcct in'ivnrclljisupporting firnnie .l neer the base ns 9 and f). The outer sui'laces ofi adapted.

to engage the inner e;

of sheave flange or annular projei'. or pulley 12 which. is li:"ntntnhle shaft 13, and, in order to t Y eieince between the outer eilgeof the it: nige en (l the s ices the suenortnw arms lie fox the lettereach are offset anal extend nuclei the flange of the o5 pulley teen.bearing sleeves 15 which are mounted on the shafts 9 and 10., The shoesare also provided with springsupporting projections 16 21ml 1.7 that areopposite each other and exteinl. for short distances into the ends" ofthe spring 6 which tenils to force the brake shoes into engngen'ientwith the pulley flange The outer einls of the shoes are PLGVlfllltl withlateral projections 18 to which pin shells 19 and 20 are secured.

The operating magnet 7 con'ipz'iscs a double Ushnpetl stationary coremember 21, an nctimting coil 22 i' 'i untecl on the intermediateprojections 0: he stationary core, illltl n. in iivnhle nien'ih '1 23which is similar to the stationary core member 21 ancl is connectci tothe exti'eniities of the shoes by means of links 24 and 25 the outerends of which lllQ mounted on the pin shafts and 220 and the inner enilsof? which 211'? l '15 all connected toggjether and to n hifnicnlzeclprojection 26 on the inomhle'coise '1. nhei", by means of :1 pin shaft2?,

-l.he zmrangeinent of per ls is such that when the eleclromingnetilcenei'gizetland so the manually operated lCvlCC S releaseihthe spring;(5 forces the shoes into enge 'enient with the pulley flange and thestationary and movable core members are nmterlnlly separated iii-inneach other. Vvncn the elccg5 tro-nnignet winding 22 is enerhjizcil, themovable col-e member 23 is attached to the stntioinu niemhci' 2'1 willthe shoes 4 and 5 are sepni'nlotl from the suii nce oil? the pnlcorn ess push-pin 528 that extends through .1 hole 29 in n hoes 30 provided atthe top of the casing l zinil rests upon the links A anil 9.5 at theirpoint of connection. The hole 29 counts horeil'to tot-in n reccss illana the cute) extremity of the push ni'ovialixl. with llCtMl (il mile! j'ch i 33 encircles the push hirg einent and the win oil the fclilzwzii'cl. inclement oi" the limited by cettei: pin, 3% the nn'zn ofparts l. ng such. the. the inn the push pin will no l.

eration of the brake unless the spring 33 is compressed by the manual.actuation of the push pin. The stationary core member 21 oftheelectro-magnet is mounted on a supportin bracket 35 which is bolted to aportion of the bottom castingof the casing and the weight of the movablecore member is sustained by, and acts in opposition to, the spring 6. i

It will be understood that the electro magnet is adapted for operationWhen either direct or alternating current energy is supplied to itsWinding.

Various structural modifications may be eilected in the deviceillustrated without departing from the spirit and scope of my invention,and I desire that only such limitations shall be imposed as areindicated in the appended claims.

I claim as my invention l. A symmetrical wheel brake comprising aflanged pulley or sheave, a pair of contact shoes having cylindricallycurved j outer surfaces lying in concentric arcs within the pulleyflange, said shoes being pivotally mounted at one end in a single plane,a pair of links joining the free ends of the shoes, an interposed springacting directly upon the shoes and tending to force them into engagementwith the pulley flange, and an electromagnet and a manually operatedthrust rod which are severally adapted to break the toggle joint formedby the two links.

2. The combination with a rotatable pulley or sheave having an annularflange, a pair of symmetrically disposed brake shoes pivotally supportedoutside of the annular flange and having cylindrically curved outersurfaces which are adapted to make frictional engagement with the innersurface of said flange, an interposed compres sion spring actingdirectly on the shoes adjacent to their pivots and tending to separatethem, a pair of links connecting the shoes at one end, an electro-magnetcentrally disposed relative, to the pulley flange and comprising astationary 'core member a magnet Winding and a movable core memher, saidmovable member being secured to the point of connection between the twolinks, and a manually-operated thrust rod for breaking the toggle jointformed by the two links.

In testimony whereof, I have hereunto subscribed my name this 27th dayof March, 1908.

CHRISTIAN AALBORG.

